Kajchamaporn, Worarat, Kittipong Dongsang, Kulyada Somsap, and Thapanawong Mitsungnern. “Happiness Status and Related Factors: A Characterization of Grade 10-12 Students at Khonkaenwittayayon School, Khon Kaen, Thailand, 2006”. Srinagarind Medical Journal 22, no. 3 (November 4, 2013): 254–260. Accessed April 25, 2024. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13147.